Liquid fuel burner of the pressure type



H. c. HEBARD 2,402,138

LIQUID FUEL BURNER oF THE PRESSURE TYPE Filed Feb. 27, 1945 2 Sheets-Shet 1 Jne 18, 1946.

uw .NIH I f .E Aw .l /9 m ,0. n, m fd 4J ME.

'97 jg INVENToR. lWHUGH CHARLES HEBARD VALEM@ @de ATTORNEY June 18, 1946. H.l c. HEBARD 2,402,138

LIQUID FUEL BURNER OF THE PRESSURE TYPE Filed Feb. 27, 1945 2 Sheets-Sheet 2 u n f 4 1 5.9

3f i l/cf J/ 5 9 I 36 3 INVENTOR.

HUGH CHARLES` HEBARn BY N mw@ M ATTORNEY Patented June 18,1946

LIQUID FUEL BURNER oF THE PRESSURE TYPE Hugh Charles Hebard, Greenford, England Application February 27, 1945, Seria-l No. 579,987 In Great Britain February 18, 1944 3 Claims. l

This invention relates to lamps and stoves of the kind adapted to burn, oil or spirit under pressure and to the kind wherein the fuel is fed from a reservoir through a vaporiser heated during operation by the burner or by a mantle carried by the burner.

In oil burning devices of the kind described it is essential to provide a means such as pricker or needle for cleaning the vaporiser orifice which is necessarily of small diameter and therefore prone to be choked by carbon. Devices of this kind are much more effective if they are situated inside the vaporiser, since any obstructing foreign matter is then expelled from the vaporiser orifice in the direction of flow and not against it.

Devices previously employed for cleaning the vaporiser orifice of a pressure burner from within have made provision for raising the cleaning needle inside the vaporiser but although means were proposed whereby pressure leakage at the point where the operating mechanism entered the reservoir was positively prevented, the assembly was complicated.

The object of the present invention is to provide an improved and simplified means for cleaning the vaporiser orifice of a pressure burner from within which does not suffer from the disadvantage mentioned above and does not necessi` tate the use of packed glands under pressure during the burner operation.

According to the invention a pressure burner for liquid fuel is provided wherein a cleaning needle carried by means fixed relatively to a fuel reservoir is disposed within a vaporiser tube flexibly connected to said reservoir and capable of depression to cause the cleaning needle to enter the orifice of the burner nipple.

According to one form of the invention a .pressure burner for liquid fuel comprises a cleaning needle fixed at its base Within a fuel reservoir above which the burner is supported, a vaporiser tube mounted around said cleaning needle and carrying the burner nipple at its upper end, means for depressing said vaporiser tube to cause the cleaning needle to enter the orifice of the vice which connects the said vaporiser tube to the reservoir and acts as a return spring after the tube has been depressed to clean the nipple orifice.

Reference will now be made to the accompanying drawings which illustrate a pressure lamp having therein a device constructed in accordance with the invention and in which:

burner nipple and a flexible metallic bellows de- Fig. v1 is an elevation partly in section of the lower portion of the lamp,

Fig. 2`is a sectional elevation of the upper portion of the lamp completing the illustration thereof in Fig. 1,

Fig. 3 is a sectional elevation of the adjusting mechanism for the vaporiser tube, and

Fig. 4 is a sectional plan taken on the line IV-IV of Fig. 3.

In the construction illustrated, the invention is shown as applied to a pressure lamp of conventional design which includes a' fuel reservoir I having a filler cap 2 and upon which reservoir is mounted a lamp structure including a base or gallery 3 through which extends a bolt 4 by which the said gallery is secured detachably to the reservoir I.` From the upper portion of the said gallery 3 extend vertical rods 5 which support at their upper ends a hood 6 provided with apertures 1 for the escape of products of combustion. The gallery 3 also supports a lamp glass or chimney 8 whose upper end engages within the lower por tion of the hood 6.

The fuel reservoir I is connected to the burner components Within the hood 6 by a vaporiser tube 9 which is adapted for slight vertical movement as hereinafter described. The lower end of the said tube `terminates within a cylindrical casing IIJ whose lower end is closed by a plug II formed with perforations I2 which enable the fuel to enter the cylinder I0 and the lower end of the vaporiser tube 9. The upper end of the cylinder I0 depends from a socket I3 formed with a flange I4 at its upper end which is fixed in the mouth of a circular opening I5 at the top of the reservoir I, The entry of the vaporiser tube 9 to the reservoir is sealed by means of a flexible metallic bellows I6 whose lower end is fixed to the exterior of the said tube at I 'I and whose upper end is see cured `to a disc I8 held within the socket I3 by means of a screw-threaded plug I9 formed integral with a nut 20 to enable it` to be inserted and removed.

Fixed within the nut 20 is a sleeve 2| having a flanged head 22 between which and the nut 20 is mounted a fixed sleeve 23 formed with a cam slot 24 whose shape is shown in Fig. 3. Surrounding the sleeve 23 is a movable sleeve 25 whose upper end is fixed to the vaporiser tube 9 by means of a transverse U-shaped pin 26 shown in Fig. 3. In the sleeve 25 is fixed an operating handle 21 whose inner end projects through the sleeve and is provided with a roller 28 engaging the cam slot 24 so that as partial rotary movement is imparted to the arm 21 the effect of the roller moving in the slot 24 is to raise or lower the sleeve 25 and vaporiser tube 9 according to the direction of movementl of the arm 21. The lower portion of the gallery 3 is cut away at 29 to accommodate the above-described means for raising and lowering the vaporiser tube.

The upper end of the vaporiser tube 9 is xed into a head 30 of larger diameter (see Fig. 2) which carries a coiled tube 3l extendinl'-,r around a burner 32 from which a mantle 33 depends. The upper end of the head 30 terminates in an orince 34 formed in a nipple 35 detachable from the member 30. A cleaning needle 36 adapted to operate in the nipple orice 34 extends completely through the vaporiser tube 9 and is secured centrally into the plug Il, as shown in Figure 1, by means of a nut 31. rEhe` nipple ori ce 34 opens into a horizontal open-ended tube 38 to which air is admitted through apertures 39 in the hood 6 and through which passes centrally a mixing tube 4l) whose upper end kis curvedif'and which communicates with the interior of the tube 3S immediately above the nipple orice 34 sozthat air is induced into the mixing tube 4l by the exit of fuel under pressure from the nipple orifice 34. The products oi combustion ascending from the mantle 33 pass around the tube 3S and escape through the outlets 1.

When movement of` the vaporiser tube is effected by means of the arm 42l the entire vaporiser tube is moved downwards so that the upper end of the needle 42 enters the orifice 34. This operation is repeated as many times as may be necessary in order to cleanse the orice, the bellows l5 operating as a return spring so as to restore the vaporiser tube to the position shown in Fig. 2 to enable operation of the lamp to proceed.

Ey means of the construction above described the vaporiser tube 9, rod 36 and cleaning needle 42 form a unit adapted to be readily detached from the reservoir l, which operation can be simply eiected byremoval of the nut 20 from the position shown in Fig. l, afterthe'gallery and hood have been removed.

I claim:

l. In a pressure-operated liquid fuel burning device, the combination of a fuel reservoir, a vaporizing tube supported by said reservoir for axial movement relatively to said reservoir, an apertured burner nozzle carrie-d by said vaporizing tube, a cleaning needle in said vaporizing tube and having i'lxed support from said reservoir, means for depressing said vaporizing tube and 4 thereby placing said cleaning needle in cleaning position in said nozzle aperture, the support for the base of said cleaning needle being within said reservoir and said vaporizing tube being mounted around said cleaning needle, and a resilient and flexible metallic bellows device connecting said vaporizing tube with said reservoir and tending to hold said vaporizing tube in its upper position. 2. In a pressure-operated liquid iuel burning device, the combination of a fuel reservoir, a vaporizing tube supported by said reservoir for axial movement relatively to said reservoir, an aper- `tured burner nozzle carried by said vaporizing tube, a cleaning needle in said vaporizing tube and having fixed support from said reservoir, means lor .depressing said vaporizing tube and thereby placing said cleaning needle in cleaning position in said nozzle aperture, the lower end portion of said vaporizing tube being in said reservoir and extending towards the base thereof, an annular socket carried by the top wall of said reservoir around said vaporizing tube and providing for free vertical movement of said vaporizing tube in said socket, and a flexible metallic bellows device disposedk around said vaporizing tube and having its lower end sealed to the exterior of said vaporizing tube and having its upper end xed to said socket.

3.1m a pressure-operated liquid fuel burning device, the combination of a fuel reservoir, a vaporizing tube supported by said reservoir for axial movement relatively to said reservoir, an apertured burner nozzle carried by said vaporizing tube, a cleaning needle in said vaporizing tube and having xed support from said reservoir, means for depressing said vaporizing tube and thereby placing said cleaning needle in cleaning position in'said nozzle aperture, the lower end portion of said vaporizing tube being in said reservoir and extending towards the base thereof, anannular socket carried by the top wall of said reservoir around said vaporizing tube and providing for free vertical movement. of said vaporizing tube in said socket, a flexible metallic bellows device disposed around said vaporizing tube and having its lower end sealed to the exterior of said vaporizing tube and having its upper end fixed to said socket, a second tube depending from said socket and surrounding said vaporizing tube and said bellows device, a perforated plug at the lower end of said second tube, and a rod xed at its lower end to said plug and carrying said cleaning needle at its upper end.

HUGH CHARLES HEBARD. 

